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Zero #368, Automatic Door Bottom, Heavy Duty Semi-Mortised, Double Neoprene, .562" Drop

Zero #368, Automatic Door Bottom, Heavy Duty Semi-Mortised, Double Neoprene, .562" Drop
Product Specs of Semi-Mortised Automatic Door Bottom #368 Clear Anodized Aluminum Door Bottom with High Sound Control Solid Neoprene Seal #368 Semi-Mortised Automatic Door Bottom #368 Applied on Interior Wooden Door with Seal in Closed Position Semi-Mortised Automatic Door Bottom #368 Applied on Interior Wooden Door with Seal in Open Position Dark Bronze Anodized Door Bottom  with High Sound Control Solid Neoprene Seal #368 Gold Anodized Door Bottom  with High Sound Control Solid Neoprene Seal #368

This Zero International #368, Semi-Mortised, Heavy Duty, High Sound Automatic Door Bottom with a double solid neoprene seal offers the best sound control for high sound levels and will prevent infiltration of light, drafts and more. Made with high-quality mechanism that has been tested to 5 million opening and closings. Sound, Smoke and Fire-Rated and is available in three anodized finishes. Length is custom cut to size. View more details in description tab below.  

How to Order: Selecting Finish and Exact Size required will give you your total price. Note, product is priced per range with 18.25"-36" being the lowest priced range. Need help to determine sizing, see How To Measure For An Automatic Door Bottom.

Price: $122.14
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SKU Z368AA|36
Shipping See Shipping Tab Below

Dimensions:  Casing measures 1.901" by .916". Made of .093" thick aluminum.

Seal:  Double solid neoprene bulb seal with maximum effective drop of .562". Note, seal extends .5" below casing.

Available Finishes: Clear Anodized, Dark Bronze Anodized and Gold Anodized Aluminum.

Compliance Details: Rated for Fire, Smoke, Sound and is UL listed (see Product Data Tab for more details.)

Handing: Compatible with both right and left handed doors.

Installation: Casing is Semi-Mortised applied to the face of the door.  Installation instructions and screws included. Screws are colored to coordinate with casing.

Sizing: To determine sizing, see How To Measure For An Automatic Door Bottom.

Please note, images are for illustrative purposes only. They are not actual photos. Therefore, actual colors may vary slightly and size many be enlarged to show detail. See product specs for exact measurements.

This product has a 1 year guarantee against defects in material and workmanship.
Click to view our Full Warranty Policy.

For a surface mounted option, see our Zero International #2673 High Sound Surface Mounted Automatic Door Bottom

How It Works

Automatic Door Bottoms utilize a concealed flat spring mechanism and plunger. When the door is closed, a brass plunger is compressed to automatically lower the seal, starting from the hinge side first. This motion ensures a smooth usage even on an uneven surface and prevents drag. The seal is automatically raised upon opening. These automatic door bottoms have been successfully tested through 5 million cycles!

See also About Automatic Door Bottoms.

Product Specs
Compliance Details

Installation Guide

Click here for a Printable Copy of How to Install an Automatic Door Bottom.

Automatic Door Bottoms are available with three mounting options: Surface Mounted, Semi-Mortised and Fully Mortised. A surface mounted application can be applied without removing the door from its hinges. For a semi-mortised, if the rabbet in the door is cut-out already, the door does not need to be removed. For a fully mortised application the door should be removed before starting. 


Once your door is ready for installation you need to determine the size required for your door bottom:

  • For a Surface Mounted Application: Measure the distance between the two stop moldings, or if a perimeter door gasket is applied, measure the distance between the two installed gaskets, then minus 1/8-1/4"” (.125”) from the total distance. That is the size needed for your door bottom.

  • For a Semi-Mortised and Fully Mortised Application: Measure your door from side to side; that is the measurement needed for your automatic door bottom.

For visual presentation see How to Measure for an Automatic Door Bottom.

How to Install an Automatic Door Bottom- Figure 1

Once you have determined the size needed, if necessary, trim your door bottom. Use a chop saw or table saw to create a perfectly straight cut.

Note, Only trim opposite the actuating plunger, brass nut. (Trimming from the brass nut side will ruin your ADB).


How to Install an Automatic Door Bottom- Figure 1You can trim from the edge up to one inch of the screw in the side wall of the ADB.



How to Install an Automatic Door Bottom- Figure 3Surface Mounted and Semi-Mortised models need to be applied to the push side of the door only (the side with the door stops). The actuating plunger needs to be applied to the hinge side of the door for all applications.

Place the automatic door bottom against the door

Once you have the automatic door bottom leveled and positioned correctly, with a pencil or marker mark where the attachment screws need to be drilled.


How to Install an Automatic Door Bottom- Figure 4

To make installation easier you can drill a pilot hole which will ensure you attach the door bottom to the correctly marked spot. With the screws provided, screw in the automatic door bottom.

In some models, a plate is provided for the hinge side of the frame. This will protect the door frame from getting worn down by the actuating plunger. If provided, attach to corresponding point on the frame.



How to Install an Automatic Door Bottom- Figure 5Now that the door bottom is attached, test the door bottom by opening and closing the door to ensure there is a full seal. If the seal does not come down far enough twist the brass nut out, if it seals too tight twist the brass nut in.

Once you have followed through with all the instructions your Automatic Door Bottom is good to go! Enjoy years of quality sound, draft and light infiltration control with your new door bottom.


Shipping / Returns
  • Ship Time:
    • This product is custom made to your specifications, please allow 2-3 weeks to ship
    • *Similar or equivalent products from other manufacturers may be available to ship sooner. For expedited processing please contact our customer service department.
    • EXCEPTIONS: Gold Anodized Aluminum and Black Anodized Aluminum Products require 2-6 week processing time.
    • Ships via major carriers, such as UPS or FedEx Ground, with tracking information provided.
  • Domestic Shipping Fees- (Hawaii and Alaska not Included):
    • FREE SHIPPING on orders over $200.00 (excludes oversized and freight orders).
    • There will be a flat $19.99 shipping and handling fee on orders under $200.00.
    • Oversized Items: Items 86" and above have an oversize surcharge of $70.00
    • Freight Orders: Items 95" and above require freight shipment and have a shipping charge of $150.00
    • Orders totals above $1,500.00 will ship free, regardless of size.
  • Alaska and Hawaii, Canada, and International Shipping:
  • Returns:
    • This product is custom made and is not returnable.
    • We are commited to your satisfaction, as a courtesy, we may, at our discretion accept returns with a minimum 30% restock fee.
    • Weatherstripping products will not be considered for returns.
    • Item must be in new, resaleable condition.
    • Please call or email us to receive an RMA number before returning. No returns will be processed without an RMA number.
    • Return shipping is customer's responsibility. A return address will be provided with RMA#.
    • If you are shipping via USPS (not recommended) do NOT require signature as we will not be able to pick up your package from local post office facility.
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